Sr20 lean miss fire

[Bnr32gtr]

Please help s13 black top has been running grate for 8 days after tune on new set up. Then today I turn the car off for about 20 mins and how has a lean miss fire. Set up s15 dbb turbo, 810cc injectors,power Fc, fmic 3 inch turbo back. Fuel psi after the filter is 36-37psi with vac hooked up and 45psi with the vac hose pinched with I think is a lil hi but maybe no since the car is tuned for 15psi boost. How do I check the fpr I have a used nismo fpr I'm going to throw on tomorrow ran out of time toning.what other things should I do/check. I have aem wide band gos all lean and u can hear/feel a slight miss fire I also checked and can feel all the injectors firing with my hand on them thanks for any help Walbro 255 is not even a month old

[Bnr32gtr]

Come on guys 75 people viewed please give me your thoughts on what I should be checking and what to do thanks

[ultimateirving]

Sounds like a coil pack is dying. Start swapping them out for good ones and see if it helps

[Blues13]

810cc injectors w/ Walbro are more than enough for a S15 turbo..you won't need to mess with the fuel pressure. Who tuned it in the first place? They should be able to narrow it down quickly by observing the symptoms.

You can start by double checking to see if your injectors are good and measure the resistance to ensure they're within specs. Injectors tend to cut out randomly when they're going bad. You can also borrow a set of known working injectors if you can to see if the problem persists (adjust the PFC accordingly).

[Bnr32gtr]

That's what it was a brand new injector went bad do u think the others will be right behind? They r not even 2 weeks old

[Blues13]

Were they actually NEW or 'refurbished' units that were modified to flow at a higher rate? Many of the cheapo ones are just that.. you never know when they will go out.

If that is your case, I'd personally return them if you can and get NEW reputable ones such as SARDs.

[Bnr32gtr]

They are Deatschwerks 810cc purple tops not even two weeks old I talked to the speed shop that I bought them from and I'm dropping all 4 off so they can send them out thanks for the replay